Carrier Transport Dynamics in High Speed Black Phosphorus Photodetectors,ACS Photonics

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Carrier Transport Dynamics in High Speed Black Phosphorus Photodetectors
ACS Photonics ( IF 6.5 ) Pub Date : 2018-01-25 00:00:00 , DOI: 10.1021/acsphotonics.7b01431
Jianbo Gao ₁ , Apparao M. Rao ₁ , Hongbo Li ₂ , Jianbing Zhang ₃ , Ou Chen ₄

Affiliation

A fundamental understanding of carrier transport mechanism is imperative for efficient semiconductor electronics and optoelectronics. Here, we use high speed black phosphorus photodetectors with sub-40 ps response time to elucidate carrier transport dynamics along its armchair and zigzag directions. Here we report a direct observation of carrier transport transition dynamics from phonon scattering transport to multiple trapping and release transport mechanism along the armchair direction, resulting from the relaxation of free carriers above the band edge to the band-tail states. We identified that the suppression of phonon scattering effects, a characteristic by Hall and field effect transistor measurements, is due to carrier transport in band tail states. Along the zigzag direction, only multiple trapping and release transport in band-tail states is observed, which might be due to low carrier mobility.

中文翻译：

高速黑磷光电探测器中的载流子传输动力学

对于有效的半导体电子学和光电子学，必须对载流子传输机制有基本的了解。在这里，我们使用响应时间低于40 ps的高速黑磷光电探测器来阐明沿其扶手椅和之字形方向的载流子传输动力学。在这里，我们报告了直接观察到的载流子迁移过程，从声子散射迁移到沿着扶手椅方向的多个俘获和释放迁移机制，这是由于自由载流子从带边缘到带尾态的弛豫而引起的。我们发现抑制声子散射效应是霍尔和场效应晶体管测量的特征，这是由于带尾态中的载流子传输所致。沿着锯齿形方向

更新日期：2018-01-25

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